An Aqueous Zn-Ion Hybrid Supercapacitor with High Energy Density and Ultrastability up to 80 000 Cycles

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Article number1902915
Journal / PublicationAdvanced Energy Materials
Publication statusOnline published - 29 Oct 2019

Abstract

Integrating a battery-type electrode to build a hybrid supercapacitor is a promising approach to improve the overall energy density of a supercapacitor-type energy storage device without sacrificing its power output. However, this strategy is usually achieved at the expense of cycling lifespan. In this work, a hybrid supercapacitor comprising Zn foil and porous carbon derived from chemical activated graphene (aMEGO) is developed, and the trade-off between energy density and cycling life is well-balanced by the utilization of 3 M Zn(CF3SO3)(2) electrolyte with high Zn stripping/plating efficiency. Such a hybrid supercapacitor demonstrates an energy density of 106.3 Wh kg-1 and a power density of 31.4 kW kg-1, and significantly a wide operation voltage of 1.9 V is achieved in aqueous electrolyte. Benefitting from the high Zn stripping/plating efficiency, the Zn-aMEGO hybrid-supercapacitor also exhibits an ultralong cycling life up to 80 000 cycles with capacity retention of 93%, which is comparable to that of conventional electrochemical double-layer capacitors.

Research Area(s)

  • aqueous electrolytes, energy storage, graphene, hybrid supercapacitors, Zn metal anodes, STORAGE, BATTERY, LIFE, SAFE

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